Choose the letter A, B, C or D to complete the sentences with given words

Do/ you/ think/ astronauts/ feel/ great sense/ loneliness/ when/ travel/ alone/ space?

A. Do you think astronauts feel great sense of loneliness when traveling alone in space?

B. Do you think astronauts feel great sense of loneliness when travel alone in space?

C. Do you think astronauts feel a great sense of loneliness when travel alone in space?

D. Do you think astronauts feel a great sense of loneliness when traveling alone in space?